Respuesta :

Answer:

2 gallons

Step-by-step explanation:

25% of 4 gallons is 1 gallons, which means that 75% of the hand sanitizer is not alcohol, and is 3 gallons. since that is the amount of not alcohol, and we want it to be 50% solution, it has to be 3 gallons of alcohol in total, and 3-1=2.

Two gallons of pure alcohol should he add to make hand sanitizer that contains 50% alcohol.

Percentage:

Given that, 4 gallons of hand sanitizer that contains 25% alcohol.

25% of 4 gallons is 1 gallons. It means that out of 4 gallons, 1 gallon are pure alcohol and 3 gallons are non- alcohol.

  • We have to make a hand sanitizer that contains 50% alcohol.
  • So that, when we add 2 gallons of alcohol in the 4 gallons of hand sanitizer.

Then,  that hand sanitizer that contains 50% alcohol.

Learn more about the percentage here:

https://brainly.com/question/19247356

Otras preguntas